// pages/recommendSong/recommendSong.js
import request from "../../../utils/request";
import PubSub from 'pubsub-js';
Page({

  /**
   * 页面的初始数据
   */
  data: {
    day: '',
    month: '',
    recommendList: [],
    index: 0,
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    //判断用户是否登录
    let userInfo = wx.getStorageSync('userInfo');
    if (!userInfo){
      wx.showToast({
        title: '请先登录',
        icon: 'none',
        success: () => {
          wx.reLaunch({
            url: '/pages/login/login'
          })
        },
      })
    }

    this.setData({
      day: new Date().getDate(),
      month: new Date().getMonth()+1,

    })

    //获取数据
    this.getRecommendListData();

    //订阅来自songDetail发布的消息
    PubSub.subscribe('switchType', (msg, type) => {
      let {recommendList, index} = this.data;
      if (type === 'pre'){
        (index === 0) && (index = recommendList.length)
        index -= 1;
      }else{
        (index === recommendList.length-1) && (index = -1)
        index += 1;
      }

      this.setData({
        index
      })

      let musicId = recommendList[index].id

      //将musicId回传给songDetail页面
      PubSub.publish('musicId', musicId)

    })
  },

  async getRecommendListData(){

    let recommendListData = await request('/recommend/songs')

    this.setData({
      recommendList: recommendListData.recommend,
    })
  },

  toSongDetail(event){
    let {song, index}= event.currentTarget.dataset;
    this.setData({
      index
    })
    //路由跳转传参： query参数
    wx.navigateTo({
      url:'/songPackage/pages/songDetail/songDetail?songId='+JSON.stringify(song.id),
    })
  },


  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {

  }
})